# -*- coding: utf-8 -*-


# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <https://gnu.org/licenses/>.


import os
from six.moves import cPickle as pickle
import json
import re
from itertools import groupby
from kobo.shortcuts import force_list
from kobo.rpmlib import make_nvra

import pungi.wrappers.kojiwrapper
from pungi.wrappers.comps import CompsWrapper
import pungi.phases.pkgset.pkgsets
from pungi.arch import get_valid_arches
from pungi.util import is_arch_multilib, retry
from pungi import Modulemd

from pungi.phases.pkgset.common import create_arch_repos, create_global_repo, populate_arch_pkgsets
from pungi.phases.gather import get_packages_to_gather

import pungi.phases.pkgset.source

try:
    from pdc_client import PDCClient
    WITH_PDC = True
except:
    WITH_PDC = False


def get_pdc_client_session(compose):
    if not WITH_PDC:
        compose.log_warning("pdc_client module is not installed, "
                            "support for modules is disabled")
        return None
    try:
        return PDCClient(
            server=compose.conf['pdc_url'],
            develop=compose.conf['pdc_develop'],
            ssl_verify=not compose.conf['pdc_insecure'],
        )
    except KeyError:
        return None


def variant_dict_from_str(compose, module_str):
    """
    Method which parses module NVR string, defined in a variants file and returns
    a module info dictionary instead.

    For more information about format of module_str, read:
    https://pagure.io/modularity/blob/master/f/source/development/
    building-modules/naming-policy.rst

    Pungi supports only N:S and N:S:V, because other combinations do not
    have sense for variant files.

    Attributes:
        compose: compose for which the variant_dict is generated
        module_str: string, the NV(R) of module defined in a variants file.
    """

    # The new format can be distinguished by colon in module_str, because
    # there is not module in Fedora with colon in a name or stream and it is
    # now disallowed to create one. So if colon is there, it must be new
    # naming policy format.
    if module_str.find(":") != -1:
        module_info = {}
        module_info['variant_type'] = 'module'

        nsv = module_str.split(":")
        if len(nsv) > 3:
            raise ValueError(
                "Module string \"%s\" is not allowed. "
                "Only NAME:STREAM or NAME:STREAM:VERSION is allowed.")
        if len(nsv) > 2:
            module_info["variant_release"] = nsv[2]
        if len(nsv) > 1:
            module_info["variant_version"] = nsv[1]
        module_info["variant_id"] = nsv[0]
        return module_info
    else:
        # Fallback to previous old format with '-' delimiter.
        compose.log_warning(
            "Variant file uses old format of module definition with '-'"
            "delimiter, please switch to official format defined by "
            "Modules Naming Policy.")

        module_info = {}
        # The regex is matching a string which should represent the release number
        # of a module. The release number is in format: "%Y%m%d%H%M%S"
        release_regex = re.compile("^(\d){14}$")

        section_start = module_str.rfind('-')
        module_str_first_part = module_str[section_start+1:]
        if release_regex.match(module_str_first_part):
            module_info['variant_release'] = module_str_first_part
            module_str = module_str[:section_start]
            section_start = module_str.rfind('-')
            module_info['variant_version'] = module_str[section_start+1:]
        else:
            module_info['variant_version'] = module_str_first_part
        module_info['variant_id'] = module_str[:section_start]
        module_info['variant_type'] = 'module'

        return module_info


@retry(wait_on=IOError)
def get_module(compose, session, module_info):
    """
    :param session : PDCClient instance
    :param module_info: pdc variant_dict, str, mmd or module dict

    :return final list of module_info which pass repoclosure
    """

    module_info = variant_dict_from_str(compose, module_info)

    query = dict(
        variant_id=module_info['variant_id'],
        variant_version=module_info['variant_version'],
        active=True,
    )
    if module_info.get('variant_release'):
        query['variant_release'] = module_info['variant_release']

    retval = session['unreleasedvariants'](page_size=-1, **query)

    # Error reporting
    if not retval:
        raise ValueError("Failed to find module in PDC %r" % query)

    module = None
    # If we specify 'variant_release', we expect only single module to be
    # returned, but otherwise we have to pick the one with the highest
    # release ourselves.
    if 'variant_release' in query:
        assert len(retval) <= 1, "More than one module returned from PDC: %s" % retval
        module = retval[0]
    else:
        module = retval[0]
        for m in retval:
            if int(m['variant_release']) > int(module['variant_release']):
                module = m

    return module


class PkgsetSourceKoji(pungi.phases.pkgset.source.PkgsetSourceBase):
    enabled = True

    def __call__(self):
        compose = self.compose
        koji_profile = compose.conf["koji_profile"]
        self.koji_wrapper = pungi.wrappers.kojiwrapper.KojiWrapper(koji_profile)
        # path prefix must contain trailing '/'
        path_prefix = self.koji_wrapper.koji_module.config.topdir.rstrip("/") + "/"
        package_sets = get_pkgset_from_koji(self.compose, self.koji_wrapper, path_prefix)
        return (package_sets, path_prefix)


def get_pkgset_from_koji(compose, koji_wrapper, path_prefix):
    event_info = get_koji_event_info(compose, koji_wrapper)
    pkgset_global = populate_global_pkgset(compose, koji_wrapper, path_prefix, event_info)
    package_sets = populate_arch_pkgsets(compose, path_prefix, pkgset_global)
    package_sets["global"] = pkgset_global

    create_global_repo(compose, path_prefix)
    for arch in compose.get_arches():
        # TODO: threads? runroot?
        create_arch_repos(compose, arch, path_prefix)

    return package_sets


def _add_module_to_variant(variant, mmd, rpms, add_to_variant_modules=False):
    """
    Adds module defined by Modulemd.Module `mmd` to variant.

    :param Variant variant: Variant to add the module to.
    :param Modulemd.Module: Modulemd instance defining the module.
    :param list rpms: List of NEVRAs to add to variant along with a module.
    :param bool add_to_variant_modules: Adds the modules also to
        variant.modules.
    """
    # Get the NSVC of module and handle the case where for some reason the
    # name/strea/version is not set.
    if not mmd.get_name() or not mmd.get_stream() or not mmd.get_version():
        raise ValueError(
            "Input module %s does not name or stream or version set."
            % mmd.dumps())
    nsvc_list = [mmd.get_name(), mmd.get_stream(), str(mmd.get_version())]
    if mmd.get_context():
        nsvc_list.append(mmd.get_context())
    nsvc = ":".join(nsvc_list)

    # Catch the issue when build system does not contain RPMs, but
    # the module definition says there should be some.
    if not rpms and mmd.get_rpm_components():
        raise ValueError(
            "Module %s does not have any rpms in 'rpms' in build system,"
            "but according to modulemd, there should be some."
            % nsvc)

    # Add RPMs from build systemto modulemd, so we can track
    # what RPM is in which module later in gather phase.
    rpm_artifacts = mmd.get_rpm_artifacts()
    for rpm_nevra in rpms:
        if rpm_nevra.endswith(".rpm"):
            rpm_nevra = rpm_nevra[:-len(".rpm")]
        rpm_artifacts.add(str(rpm_nevra))
    mmd.set_rpm_artifacts(rpm_artifacts)
    variant.mmds.append(mmd)

    if add_to_variant_modules:
        variant.modules.append(nsvc)


def _get_modules_from_pdc(compose, session, variant, variant_tags):
    """
    Loads modules for given `variant` from PDC `session`, adds them to
    the `variant` and also to `variant_tags` dict.

    :param Compose compose: Compose for which the modules are found.
    :param PDCClient session: PDC session.
    :param Variant variant: Variant with modules to find.
    :param dict variant_tags: Dict populated by this method. Key is `variant`
        and value is list of Koji tags to get the RPMs from.
    """
    if not session:
        return

    # Find out all modules in every variant and add their Koji tags
    # to variant and variant_tags list.
    for module in variant.get_modules():
        pdc_module = get_module(compose, session, module["name"])

        mmd = Modulemd.Module.new_from_string(pdc_module["modulemd"])
        mmd.upgrade()
        _add_module_to_variant(variant, mmd, pdc_module["rpms"])

        tag = pdc_module["koji_tag"]
        variant_tags[variant].append(tag)

        module_msg = "Module {module} in variant {variant} will use Koji tag {tag}.".format(
            variant=variant, tag=tag, module=module["name"])
        compose.log_info("%s" % module_msg)


def _get_modules_from_koji_tags(
        compose, koji_wrapper, event_id, variant, variant_tags):
    """
    Loads modules for given `variant` from Koji, adds them to
    the `variant` and also to `variant_tags` dict.

    :param Compose compose: Compose for which the modules are found.
    :param KojiWrapper koji_wrapper: Koji wrapper.
    :param dict event_id: Koji event ID.
    :param Variant variant: Variant with modules to find.
    :param dict variant_tags: Dict populated by this method. Key is `variant`
        and value is list of Koji tags to get the RPMs from.
    """
    # Find out all modules in every variant and add their Koji tags
    # to variant and variant_tags list.
    koji_proxy = koji_wrapper.koji_proxy
    for modular_koji_tag in variant.get_modular_koji_tags():
        tag = modular_koji_tag["name"]

        # List all the modular builds in the modular Koji tag.
        # We cannot use latest=True here, because we need to get all the
        # available streams of all modules. The stream is represented as
        # "release" in Koji build and with latest=True, Koji would return
        # only builds with highest release.
        module_builds = koji_proxy.listTagged(
            tag, event=event_id["id"], inherit=True, type="module")

        # Find the latest builds of all modules. This does following:
        # - Sorts the module_builds descending by Koji NVR (which maps to NSV
        #   for modules).
        # - Groups the sorted module_builds by NV (NS in modular world).
        #   In each resulting `ns_group`, the first item is actually build
        #   with the latest version (because the list is still sorted by NVR).
        # - Groups the `ns_group` again by "release" ("version" in modular
        #   world) to just get all the "contexts" of the given NSV. This is
        #   stored in `nsv_builds`.
        # - The `nsv_builds` contains the builds representing all the contexts
        #   of the latest version for give name-stream, so add them to
        #   `latest_builds`.
        latest_builds = []
        module_builds = sorted(
            module_builds, key=lambda build: build['nvr'], reverse=True)
        for ns, ns_builds in groupby(
                module_builds, key=lambda x: ":".join([x["name"], x["version"]])):
            for nsv, nsv_builds in groupby(
                    ns_builds, key=lambda x: x["release"].split(".")[0]):
                latest_builds += list(nsv_builds)
                break

        # For each latest modular Koji build, add it to variant and
        # variant_tags.
        for build in latest_builds:
            # Get the Build from Koji to get modulemd and module_tag.
            build = koji_proxy.getBuild(build["build_id"])
            module_tag = build.get("extra", {}).get("typeinfo", {}).get(
                "module", {}).get("content_koji_tag", "")
            modulemd = build.get("extra", {}).get("typeinfo", {}).get(
                "module", {}).get("modulemd_str", "")
            if not module_tag or not modulemd:
                continue

            variant_tags[variant].append(module_tag)

            # Get the list of all RPMs which are tagged in the modular
            # Koji tag for this NSVC and add them to variant.
            tagged_rpms = koji_proxy.listTaggedRPMS(
                module_tag, event=event_id["id"], inherit=True, latest=True)[0]
            rpms = [make_nvra(rpm, add_epoch=True, force_epoch=True) for rpm in
                    tagged_rpms]
            mmd = Modulemd.Module.new_from_string(modulemd)
            mmd.upgrade()
            _add_module_to_variant(variant, mmd, rpms, True)

            module_msg = "Module {module} in variant {variant} will use Koji tag {tag}.".format(
                variant=variant, tag=module_tag, module=build["nvr"])
            compose.log_info("%s" % module_msg)



def populate_global_pkgset(compose, koji_wrapper, path_prefix, event_id):
    all_arches = set(["src"])
    for arch in compose.get_arches():
        is_multilib = is_arch_multilib(compose.conf, arch)
        arches = get_valid_arches(arch, is_multilib)
        all_arches.update(arches)

    # List of compose tags from which we create this compose
    compose_tags = []

    # List of compose_tags per variant
    variant_tags = {}

    # In case we use "nodeps" gather_method, we might now the final list of
    # packages which will end up in the compose even now, so instead of reading
    # all the packages from Koji tag, we can just cherry-pick the ones which
    # are really needed to do the compose and safe lot of time and resources
    # here. This only works if we are not creating bootable images. Those could
    # include packages that are not in the compose.
    packages_to_gather, groups = get_packages_to_gather(
        compose, include_arch=False, include_prepopulated=True)
    if groups:
        comps = CompsWrapper(compose.paths.work.comps())
        for group in groups:
            packages_to_gather += comps.get_packages(group)
    if compose.conf["gather_method"] == "nodeps" and not compose.conf.get('bootable'):
        populate_only_packages_to_gather = True
    else:
        populate_only_packages_to_gather = False

    # In case we use "deps" gather_method, there might be some packages in
    # the Koji tag which are not signed with proper sigkey. However, these
    # packages might never end up in a compose depending on which packages
    # from the Koji tag are requested how the deps are resolved in the end.
    # In this case, we allow even packages with invalid sigkeys to be returned
    # by PKGSET phase and later, the gather phase checks its results and if
    # there are some packages with invalid sigkeys, it raises an exception.
    allow_invalid_sigkeys = compose.conf["gather_method"] == "deps"

    session = get_pdc_client_session(compose)
    for variant in compose.all_variants.values():
        # pkgset storing the packages belonging to this particular variant.
        variant.pkgset = pungi.phases.pkgset.pkgsets.KojiPackageSet(
            koji_wrapper, compose.conf["sigkeys"], logger=compose._logger,
            arches=all_arches)
        variant_tags[variant] = []

        # Get the modules from Koji tag or from PDC, depending on
        # configuration.
        modular_koji_tags = variant.get_modular_koji_tags()
        if (variant.modules or modular_koji_tags) and not Modulemd:
            raise ValueError(
                "pygobject module or libmodulemd library is not installed, "
                "support for modules is disabled, but compose contains "
                "modules.")

        if modular_koji_tags:
            included_modules_file = os.path.join(
                compose.paths.work.topdir(arch="global"),
                "koji-tag-module-%s.yaml" % variant.uid)
            _get_modules_from_koji_tags(
                compose, koji_wrapper, event_id, variant, variant_tags)
        elif variant.modules:
            included_modules_file = os.path.join(
                compose.paths.work.topdir(arch="global"),
                "pdc-module-%s.yaml" % variant.uid)
            _get_modules_from_pdc(compose, session, variant, variant_tags)

        # Ensure that every tag added to `variant_tags` is added also to
        # `compose_tags`.
        for variant_tag in variant_tags[variant]:
            if not variant_tag in compose_tags:
                compose_tags.append(variant_tag)

        if variant.mmds:
            Modulemd.Module.dump_all(variant.mmds, included_modules_file)
        if not variant_tags[variant] and variant.modules is None:
            variant_tags[variant].extend(force_list(compose.conf["pkgset_koji_tag"]))

    # Add global tag(s) if supplied.
    if 'pkgset_koji_tag' in compose.conf:
        if compose.conf["pkgset_koji_tag"] == "not-used":
            # The magic value is used for modular composes to avoid errors
            # about missing option. It should be removed in next version.
            compose.log_warning('pkgset_koji_tag is set to "not-used", but the '
                                'option is no longer required. Remove it from '
                                'the configuration.')
        else:
            compose_tags.extend(force_list(compose.conf["pkgset_koji_tag"]))

    inherit = compose.conf["pkgset_koji_inherit"]
    global_pkgset_path = os.path.join(
        compose.paths.work.topdir(arch="global"), "pkgset_global.pickle")
    if compose.DEBUG and os.path.isfile(global_pkgset_path):
        msg = "Populating the global package set from tag '%s'" % compose_tags
        compose.log_warning("[SKIP ] %s" % msg)
        with open(global_pkgset_path, "rb") as f:
            global_pkgset = pickle.load(f)
    else:
        global_pkgset = pungi.phases.pkgset.pkgsets.KojiPackageSet(
            koji_wrapper, compose.conf["sigkeys"], logger=compose._logger,
            arches=all_arches)
        # Get package set for each compose tag and merge it to global package
        # list. Also prepare per-variant pkgset, because we do not have list
        # of binary RPMs in module definition - there is just list of SRPMs.
        for compose_tag in compose_tags:
            compose.log_info("Populating the global package set from tag "
                             "'%s'" % compose_tag)
            pkgset = pungi.phases.pkgset.pkgsets.KojiPackageSet(
                koji_wrapper, compose.conf["sigkeys"], logger=compose._logger,
                arches=all_arches, packages=packages_to_gather,
                allow_invalid_sigkeys=allow_invalid_sigkeys,
                populate_only_packages=populate_only_packages_to_gather)
            # Create a filename for log with package-to-tag mapping. The tag
            # name is included in filename, so any slashes in it are replaced
            # with underscores just to be safe.
            logfile = compose.paths.log.log_file(
                None, 'packages_from_%s' % compose_tag.replace('/', '_'))
            pkgset.populate(compose_tag, event_id, inherit=inherit, logfile=logfile)
            for variant in compose.all_variants.values():
                if compose_tag in variant_tags[variant]:
                    # Optimization for case where we have just single compose
                    # tag - we do not have to merge in this case...
                    if len(variant_tags[variant]) == 1:
                        variant.pkgset = pkgset
                    else:
                        variant.pkgset.fast_merge(pkgset)
            # Optimization for case where we have just single compose
            # tag - we do not have to merge in this case...
            if len(compose_tags) == 1:
                global_pkgset = pkgset
            else:
                global_pkgset.fast_merge(pkgset)
        with open(global_pkgset_path, 'wb') as f:
            data = pickle.dumps(global_pkgset)
            f.write(data)

    # write global package list
    global_pkgset.save_file_list(
        compose.paths.work.package_list(arch="global"),
        remove_path_prefix=path_prefix)
    return global_pkgset


def get_koji_event_info(compose, koji_wrapper):
    koji_proxy = koji_wrapper.koji_proxy
    event_file = os.path.join(compose.paths.work.topdir(arch="global"), "koji-event")

    if compose.koji_event:
        koji_event = koji_proxy.getEvent(compose.koji_event)
        compose.log_info("Setting koji event to a custom value: %s" % compose.koji_event)
        json.dump(koji_event, open(event_file, "w"))
        return koji_event

    msg = "Getting koji event"
    if compose.DEBUG and os.path.exists(event_file):
        compose.log_warning("[SKIP ] %s" % msg)
        result = json.load(open(event_file, "r"))
    else:
        compose.log_info(msg)
        result = koji_proxy.getLastEvent()
        json.dump(result, open(event_file, "w"))
    compose.log_info("Koji event: %s" % result["id"])
    return result